单项选择题

A ______ school boy, Li Li da, first tried to swim across the Qiongzhou Channel in June, 2000.

A．12-year old
B．12-years-old
C．12 years old
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单项选择题
I think no news ______good news. He will be back soon.
A．are
B．is
C．was
单项选择题
His sister read the picture-book three times yesterday,______.
A．so she did
B．she did so
C．so did she
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